Table of Contents
ISRN Ophthalmology
Volume 2011 (2011), Article ID 138941, 6 pages
http://dx.doi.org/10.5402/2011/138941
Clinical Study

The Role of Axial Length-Corneal Radius of Curvature Ratio in Refractive State Categorization in a Nigerian Population

1Department of Optometry, Faculty of Life Sciences, University of Benin, Benin City, Nigeria
2Eye Clinic, Faith Medical Complex, Benin City, Nigeria

Received 19 April 2011; Accepted 15 May 2011

Academic Editors: A. Daxer, A. Kakehashi, and Á. Szél

Copyright © 2011 Eghosasere Iyamu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The aim of this study was to investigate the association of axial length (AL)/corneal radius of curvature (CRC) ratio (AL/CRC) with spherical equivalent refractive state (SER) in young adults. A total of seventy ( 𝑛 = 7 0 ) subjects consisting of 31 males and 39 females participated in this study. Subjects were categorized into emmetropia, hyperopia and myopia using the spherical equivalent refraction. The axial length was measured with I-2100 A-Scan ultrasonography/Biometer (CIMA Technology, USA), the corneal radius of curvature with Bausch & Lomb H-135A (Bausch & Lomb Corp., USA), and the refractive state by static retinoscopy and subjective refraction. The mean AL, CRC and AL/CRC ratio of all subjects were 23.74 ± 0.70 mm, 7.84 ± 0.19 mm, and 3.03 ± 0.14, respectively. Myopes had significantly longer AL, steeper CRC and higher AL/CRC ratio than the emmetropes and hyperopes. There was statistically significant inverse correlation between AL and CRC ( π‘Ÿ = βˆ’ 0 . 5 3 , 𝑃 < 0 . 0 0 0 1 ), SER ( π‘Ÿ = βˆ’ 0 . 6 4 , 𝑃 < 0 . 0 0 0 1 ), and between SER and AL/CRC ( π‘Ÿ = βˆ’ 0 . 7 8 , 𝑃 < 0 . 0 0 0 1 ). A significant positive correlation was found between CRC and SER ( π‘Ÿ = βˆ’ 0 . 6 9 , 𝑃 < 0 . 0 0 0 1 ). The categorization of the refractive state of an individual is better done by using the AL/CRC ratio index.